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PM / Domains: Convert pm_genpd_init() to return an error code

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The are already cases when pm_genpd_init() can fail. Currently we hide the
failures instead of propagating an error code, which is a better method.

Moreover, to prepare for future changes like moving away from using a
fixed array-size of the struct genpd_power_state, to instead dynamically
allocate data for it, the pm_genpd_init() API needs to be able to return
an error code, as allocation can fail.

Current users of the pm_genpd_init() is thus requested to start dealing
with error codes. In the transition phase, users will have to live with
only error messages being printed to log.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2016-06-17 12:27:52 +02:00 • committed by Rafael J. Wysocki
parent 122a22377a
commit 7eb231c337
2 changed files with 12 additions and 7 deletions
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10
drivers/base/power/domain.c
View file

@ -1258,12 +1258,14 @@ EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
* @genpd: PM domain object to initialize. * @genpd: PM domain object to initialize.
* @gov: PM domain governor to associate with the domain (may be NULL). * @gov: PM domain governor to associate with the domain (may be NULL).
* @is_off: Initial value of the domain's power_is_off field. * @is_off: Initial value of the domain's power_is_off field.
*
* Returns 0 on successful initialization, else a negative error code.
*/ */
void pm_genpd_init(struct generic_pm_domain *genpd, int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off) struct dev_power_governor *gov, bool is_off)
{ {
if (IS_ERR_OR_NULL(genpd)) if (IS_ERR_OR_NULL(genpd))
return; return -EINVAL;
INIT_LIST_HEAD(&genpd->master_links); INIT_LIST_HEAD(&genpd->master_links);
INIT_LIST_HEAD(&genpd->slave_links); INIT_LIST_HEAD(&genpd->slave_links);
@ -1321,6 +1323,8 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
mutex_lock(&gpd_list_lock); mutex_lock(&gpd_list_lock);
list_add(&genpd->gpd_list_node, &gpd_list); list_add(&genpd->gpd_list_node, &gpd_list);
mutex_unlock(&gpd_list_lock); mutex_unlock(&gpd_list_lock);
return 0;
} }
EXPORT_SYMBOL_GPL(pm_genpd_init); EXPORT_SYMBOL_GPL(pm_genpd_init);

9
include/linux/pm_domain.h
View file

@ -127,8 +127,8 @@ extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *new_subdomain); struct generic_pm_domain *new_subdomain);
extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *target); struct generic_pm_domain *target);
extern void pm_genpd_init(struct generic_pm_domain *genpd, extern int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off); struct dev_power_governor *gov, bool is_off);
extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor simple_qos_governor;
extern struct dev_power_governor pm_domain_always_on_gov; extern struct dev_power_governor pm_domain_always_on_gov;
@ -163,9 +163,10 @@ static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
{ {
return -ENOSYS; return -ENOSYS;
} }
static inline void pm_genpd_init(struct generic_pm_domain *genpd, static inline int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off) struct dev_power_governor *gov, bool is_off)
{ {
return -ENOSYS;
} }
#endif #endif